Can you please help me understand this search result? Please go to the above URL and enter 978-0993436727 in the Limit search by ISBN field. Then click the magnifying glass icon to trigger the search. My question is why are there two posts in the results when there is only one post containing that ISBN value?
I am including a screen print of the ISBN custom field setup.
I suspect that probably the ISBN field is not set for the non-matching result, or maybe the connection logic is not correct. Please check these two options, if they are set like this: https://i.imgur.com/QWCqHOH.png